Python Tutorials - Variables Insights
Unlock the power of Python with our essential guide to Variables in Python! In this video, we delve into the fundamentals that every aspiring programmer needs to master. Learn how to effectively use the *type function* to uncover data types, the *print function* to display outputs beautifully, and how the *id function* reveals unique object identifiers. Plus, we introduce the fascinating *chr function* to convert integers to characters, and the *ord function* to do the reverse! Whether you're a complete beginner or brushing up on your skills, this tutorial will set you on the path to Python mastery. Don't miss out—hit play now!
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Variable Internals in Python
Already we know this thing clearly, Python is an object oriented language.
In Python, an object is a fundamental concept representing an instance of a class. Everything in Python is an object, including numbers, strings, functions, list, tuples etc.
Similarly, we can say that variable is also an object that refers to a value.
Every Python Object has three key attributes associated to it.
• A type
type() Function :- built-in function, returns the type of an object.
• A value
print() :- also a built-in function, use to display value of an object.
• An id
Id() function :- It returns the memory location of an object. It is also a built-in function in python.
Chr() & ord() Function in Python
1. Chr() Function
The chr() function in Python is a built-in function that takes an integer as an argument and returns a character values associated with integer (string value).
Key Points :
Unicode Support:
chr() handles the full range of Unicode characters, allowing you to represent a wide variety of symbols, letters, and special characters.
ValueError for Invalid Input:
Syntax : - chr(number)
If the integer passed to chr() is outside the valid Unicode range (0 to 1,114,111), a ValueError will be raised.
2. ord() function
The ord() function in Python is a built-in function that returns the their numeric equivalents (Unicode code point). Inverse of chr() function.
Syntax :- ord(character)
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ASCII, or American Standard Code for Information Interchange, is a character encoding standard that assigns a unique numerical value to letters, numbers, punctuation, and control characters, allowing electronic devices to process and communicate text. Developed in the 1960s, the original ASCII standard uses a 7-bit code for 128 characters, which includes printable characters like A-Z, a-z, and 0-9, as well as non-printable control codes. While the foundational 128-character set of modern standards like Unicode is based on ASCII, Unicode offers a much larger and more comprehensive set of code points to support diverse languages and symbols globally.
Key Aspects of ASCII
Encoding:
ASCII provides a way to represent characters as numbers, as computers fundamentally work with numbers.
Standard:
It was one of the earliest and most influential character encoding standards, establishing a universal way for computers to handle text.
Character Set:
The original standard includes:
Control Characters: 33 non-printable codes (0-31) for tasks like line feeds and tabs.
Printable Characters: 95 characters (32-126), such as uppercase and lowercase English letters, numbers (0-9), and common symbols.
Modern Context:
ASCII is still fundamental for legacy systems and as the basis for modern standards.
Unicode (specifically UTF-8) is the dominant character encoding on the web and in modern computing, but its first 128 characters are identical to ASCII.